Description: block: memory leak when merging small consecutive buffers in SCSI IO vectors
References:
 http://www.openwall.com/lists/oss-security/2017/10/10/4
 https://marc.info/?t=150605752800001&r=1&w=2
 https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495884.html
 https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495887.html
 http://www.openwall.com/lists/oss-security/2017/10/18/9
Notes:
 bwh> This appears to have been introduced in 2.6.16 by commit 80cfd548eed6
 bwh> "[BLOCK] bio: check for same page merge possibilities in __bio_add_page()"
Bugs:
 https://bugzilla.redhat.com/show_bug.cgi?id=1495089
upstream: released (4.14-rc5) [95d78c28b5a85bacbc29b8dba7c04babb9b0d467]
4.9-upstream-stable: released (4.9.57) [5444d8ab9a1406af9f1bc2f00c26838637542480]
3.16-upstream-stable: released (3.16.50) [3c885aa3b459aabc5fa04251a5fdd88e29b1de70]
3.2-upstream-stable: released (3.2.95) [9ff5d8fe36745867da8a028b3ea58629f7546155]
sid: released (4.13.10-1)
4.9-stretch-security: released (4.9.65-1)
3.16-jessie-security: released (3.16.51-1)
3.2-wheezy-security: released (3.2.96-1)